Polycom RealPresence 2000, Руководство администратора

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Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
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Polycom, Inc.
For more information see “ High Resolution Slides ” on page 1-14 .
H.263 4CIF Guidelines
• H.263 4CIF is supported with H.323, SIP and ISDN connection endpoints.
• H.263 4CIF is supported in CP mode only.
• Click&View is supported in H.263 4CIF.
• AES encryption is supported with H.263 4CIF.
• Recording of H.263 4CIF conferences is supported by the RSS 4000 and other devices.
• All video layouts are supported in H.263 4CIF, except 1x1 layout. In a 1x1 layout, the
resolution will be CIF.
• H.239 is supported in H.263 4CIF and is based on the same bandwidth decision matrix
as for HD.
The CP Resolution Decision Matrix
All the CP resolution options and settings are based on a decision matrix which matches
video resolutions to connection line rates, with the aim of providing the best balance
between resource usage and video quality at any given line rate.
The following factors affect the decision matrices:
•
The Media card(s) installed in the system affect the number of video resources used for
each video resolution and frame rate, the supported video protocols and the maximum
resolution that can be used by the RMX. For example, 1080p 30fps resolution is
supported only with MPM+ and MPMx media cards and not by MPM cards.
• The used video protocol: H.264 base Profile or H .264 High Profile . The H.264 High Profil e
maintains the Video quality at bit rates that are up to 50% lower than previously
required. For example, a 512 kbps call will have the video quality of a 1Mbps HD call
while a 1Mbps HD call has higher video quality at the same (1Mbps) bit rate.
H.264 High Profile is supported only with MPMx media cards.
• A different decision matrix is used for Motion and Sharpness as the quality requirements
are different.
By default, the system shipped with three pre-defined settings of the decision matrix for
H.264 Base Profile and three pre-defined settings of the decision matrix for H.264 High Profile
with Motion and Sharpness video quality for each:
•
Resource-Quality Balanced (default)
A balance between video quality and resource usage. This is the only available
resolution configuration in version 6.0.x and earlier.
• Resource Optimized
System resource usage is optimized by allowing high resolution connections only at
high line rates and may result in lower video resolutions (in comparison to other
resolution configurations) for some line rates. This option allows to save MCU
resources and increase the number of participant connections.
• Video Quality Optimized
Video is optimized through higher resolution connections at lower line rates increasing
the resource usage at lower line rates. This may decrease the number of participant
connections.